Standard library header <cstddef>

This header was originally in the C standard library as <stddef.h>.

This header is part of the utility library.

Macros

NULL	implementation-defined null pointer constant (macro constant)
offsetof	byte offset from the beginning of a standard-layout type to specified member (function macro)

Types

size_t	unsigned integer type returned by the sizeof operator (typedef)
ptrdiff_t	signed integer type returned when subtracting two pointers (typedef)
nullptr_t (C++11)	the type of the null pointer literal nullptr (typedef)
max_align_t (C++11)	POD type with alignment requirement as great as any other scalar type (typedef)

Notes

• NULL is also defined in the following headers:
  • <clocale>
  • <ctime>
  • <cstring>
  • <cstdio>
  • <cwchar>
• std::size_t is also defined in the following headers:
  • <ctime>
  • <cstring>
  • <cstdio>
  • <cwchar>